I was looking at yesterday's timelapse video (24 hr in 2 minutes) taken from the Berkeley hills looking west to the Golden Gate Bridge. At 1min, 12 seconds, a cloud starts to form just right of center, and it forms into a long contrail-esque cloud, that passes out of view at 1 min, 15 seconds. From the way it appears in the timelapse, it doesn't look to me like it was caused by a plane. But, it also doesn't look natural. What do you think? (see attached file -hopefully it's in a viewable format).
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